Actually, yes, the current timezones do tell me that. The time known as 7 AM is early morning everywhere. 11 AM is late morning everywhere. 2 PM is early after

Actually, yes, the current timezones do tell me that. The time known as 7 AM is early morning everywhere. 11 AM is late morning everywhere. 2 PM is early afternoon everywhere. 8 PM is mid evening everywhere. By their definition, timezones are 100% accurate for telling the "part of the day". They're inaccurate in the sense of telling where the sun is in the sky - not too big of a deal, really. But even then, they're close enough for casual purposes.